PXN20RM Datasheet, PDF (1043/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

Enhanced Serial Communication Interface (eSCI)
The priority scheme of the transmitter (described in Table 31-25) ensures that the preamble is transmitted
before the data frame.
Freescale Semiconductor
PXN20 Microcontroller Reference Manual, Rev. 1
31-53